Fuse link thkowout device



July 28, 1942.

FUSE LINK THROWOUT DEVICE Original Filed March 10, 1937 INVENTOR.

Reissued July 28, 1942 FUSE LINK 'THROWOUT DEVICE William 0. Schultz, South Milwaukee, Wis., as-

signor -to Line waukee, Wis, a

Material Company, South Milcorporation of Delaware Original No. 2,126,217, dated August9, 1938, Serial '7 Claims.

This invention relates to improvements in fuse link throwout devices for expulsion which it may be subjected.

More specifically, it is an object of this in- In the drawing:

Fig. 1 is a side elevation illustrating a pref erred form of this invention.

Fig. 2 is a fragmentary view in side elevation of the device shown in Fig. 1 after it has operated.

Fig. 3 is a lower end view'of the device shown in Fig. 1.

Like parts are identified by the same reference characters throughout the several views.

relative to the cartridge I. 8 is also provided with a threaded recess extendsleet hood I is provided with H having a vertically extending portion l2 positioned in the 9 and removably secured therein by means of the clamping bolt 6. sleet hood I 0 is also p apron or skirt l3 com by a septum immediately adjacent the hollow or recess 21 in the hood H), the skirt,

March 10, 1937. reissue October 12, 1939, Serial Application for No. 299,188

turn extending below the arm II and with a clamping jaw l4 extending in a horizontal direction laterally from the lower margin of the As shown, this jaw I4 is provided with an the clamping en these jaws have been separated sufiiciently, the link may then be placed between them and upon release of the lever [6, the spring 25 will clamp the jaws to the link I.

This extended portion ISA serves as a means for manually moving the lever I6 to separate the jaws l4 and 23. It "will be further observed that the link-engaging finger I8 on the lever IB is didefining tween said arm and lever rectly beneath the cartridge I. Consequently, when the jaws l4 and 23 are separated by pressing down on the portion ISA, the finger l8 will contact the end of the cartridge and serve as a pivot point while the link 1 is being inserted between the jaws.

Although the finger I8 is not shown in contact with the lower end of the cartridge, nevertheless, it will be obvious that its position relative to the cartridge when in link-stressing position, will be a matter of choice when the link is mounted in the cartridge.

Fig. 2 illustrates the portion ISA on the lever H5 in contact with the lower margin or septum portion of the hood [0, thereby serving as a stop the final position of the lever after the link 1 has been withdrawn from the cartridge The device illustrated in Figs. 1 to 3, inclusive, operates as follows: Assuming that the fuse link I has been tensioned as illustrated in Fig. l, and that an overload has destroyed the upper end of the fuse link (not shown), the spring 25 will cause the lever to rotate about the pin I5 and thereby move the fuse link in a path extending downwardly and arcuately from the lower end of the tube I. When the lever l6 has moved a given distance in the path indicated, the jaws I4 and 23 will be separated sufficiently to permit the link to drop from the structure, thereby clearly indicating that the circuit through the fuse has been opened.

From the foregoing disclosure, it becomes obvious that I have provided for a throwout device having a spring-actuated lever, a novel shielding hood for the spring and the lever pivot which will prevent the accumulation of sleet.

I claim:

I. In a fuse link throwout device for expulsion fuse cartridges, a supporting arm adapted for attachment to a fuse cartridge, a throwout lever pivotally mounted on said arm and having a link-tensioning position, said lever being pivotally mounted intermediate its ends to provide a link-tensioning arm and lever-actuating arm, a spring coacting between said supporting arm and link-tensioning arm to move said lever from its link-tensioning position, and a protecting hood and apron substantially enclosing said spring and pivot.

2. In a fuse link throwout device for expulsion fuse cartridges, a supporting arm adapted for attachment to a fuse cartridge, a throwout lever pivotally mounted on said arm and having a link-tensioning position, a spring coacting beto move said lever from its link-tensioning position, said lever being slidable on its pivotal connection with said arm in a direction opposed to the direction of movement of said spring, and a hood and apron substantially enclosing said spring and pivotal connection.

3. In a fuse link throwout device for expulsion fuse cartridges, a supporting arm having one end adapted for attachment to a cartridge and the other end provided with a cavity and a pair of relatively spaced paralleling aprons, extending from the open end of said cavity, a pivot pin secured to and extending between said aprons, a throwout lever having a pivot arm positioned between said aprons and provided with an elongated slot slidably receiving said pin, said lever having upon one side of said pivot arm a fuse link-engaging finger and upon the other side of said pivot arm a lever-actuating extension receivable in said recess, and a spring anchored at one end to the bottom of said recess and connected at the other end with said extension.

link throwout device for expulsion fuse cartridges, a supporting arm having one end adapted for cartridge and the other end provided with a cavity and a pair of relatively spaced paralleling aprons extending from the open end of said cavity, a pivot pin secured to and extending between said aprons, a throwout lever having a pivot arm positioned between said aprons and provided with an elongated slot slidably receiving said pin, said lever having upon one side of said pivot arm a fuse link-engaging finger and upon the other side of lever-actuating extension receivable in said recess, a clamping jaw on one of said aprons adjacent the margin thereof and projecting laterally therefrom, a cooperating clamping jaw on said lever, and a spring anchored at one end to the bottom of said recess and connected at the other end with said extension.

5. In a fuse link throwout device for expulsion fuse cartridges, a supporting arm having one end adapted for attachment to a cartridge and the other end provided with a cavity and a pair of relatively spaced paralleling aprons extending from the open end of said cavity, a pivot pin secured to and extending between said aprons, a throwout lever having a pivot arm positioned between said aprons and provided with anelongated slot slidably receiving said pin, said lever having upon one side of said pivot arm a fuse link-engaging finger and upon the other side of said pivot arm a lever-actuating extension receivable in said recess, and a stop on said extension engageable with said support.

6. In a fuse link throwout device for expulsion fuse cartridges, a supporting arm having one end adapted for attachment to a cartridge and the other end provided with a cavity and a pair of relatively spaced paralleling aprons extending from the open end of said cavity, a pivot pin secured to and extending between said aprons, a throwout lever having a pivot arm positioned between said aprons and provided with an elongated slot slidably receiving said pin, said lever having upon one side of said pivot arm a fuse link-engaging finger and upon the other side of said pivot arm a lever-actuating extension receivable in said recess, a clamping jaw on one of said aprons adjacent the margin thereof and projecting laterally therefrom, a cooperating clamping jaw on said lever, a spring anchored at one end to the bottom of said recess and connected at the other end with said extension, and a stop on said extension engageable with said support.

'1. In a fuse link throwout device for expulsion fuse cartridges, a supporting arm adapted for attachment to a fuse cartridge, a throwout lever pivotallyrnounted on said arm and having a linktensioning position, a spring coacting between said arm and lever to move said lever from its link-tensioning position, said lever being movable on its pivotal connection with said arm in a direction radially relative to said connection and opposed to the action of said spring, and inter-acting clamping jaws on said arm and lever in proximity to said pivotal connection and separable when said lever is moved in said radial direction, the free end of said lever having a fuse link engaging portion for exerting a tension thereon.

WILLIAM O. SCHULTZ. 

